{
  "annotation_id": "8c9bc42a-d61a-4edc-a8ee-4139d99fca2f",
  "date_created": "2026-03-02T18:00:05.096000Z",
  "date_modified": "2026-03-02T18:00:05.096000Z",
  "file_hash": "46abcf257c37c36b72334b9a86f009a0958ad1283ca36b4af830232a7bf70a31",
  "private": false,
  "record": {
    "abstract": "The $\\eta$-nucleon ($\\eta$N) interactions are deduced from the heavy baryon\nchiral perturbation theory up to the next-to-leading-order terms. Combining the\nrelativistic mean-field theory for nucleon system, we have studied the\nin-medium properties of $\\eta$-meson. We find that all the elastic scattering\n$\\eta$N interactions come from the next-to-leading-order terms. The $\\eta $N\nsigma term is found to be about 280$\\pm$130 MeV. The off-shell terms are also\nimportant to the in-medium properties of $\\eta$-meson. On application of the\nlatest determination of the $\\eta$N scattering length, the ratio of\n$\\eta$-meson effective mass to its vacuum value is near $0.84\\pm0.015$, while\nthe optical potential is about $-(83\\pm5)$ MeV, at the normal nuclear density.",
    "arxiv_id": "nucl-th/0506020",
    "authors": [
      "X. H. Zhong",
      "G. X. Peng",
      "Lei Li",
      "P. Z. Ning"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.73.015205",
    "journal_ref": "Phys. Rev. C 73, 015205 (2006)",
    "title": "$\\eta$-meson in nuclear matter",
    "url": "https://arxiv.org/abs/nucl-th/0506020"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "95447b83-c3dd-446d-892c-d84bac92c918",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}